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Performance issues with 2x 6870 crossfire. Help!

Tags:
  • Radeon
  • Performance
  • Crossfire
  • Graphics
Last response: in Graphics & Displays
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January 18, 2012 6:16:41 AM

I just bought a second Sapphire HD 6870 to compliment the one I bought just a couple months ago. GPU-z has been recognizing both cards, so I was expecting to see a performance increase in my games. WRONG!

I have noticed that my games have been performing much better when I disable crossfire. In every game I try (I have tried about 10-15 different games from my steam library), my FPS is about 10-20 less with crossfire, as will as being a lot more stuttery.

I have done a clean sweep with DriverSweeper in safe mode, downloaded the latest CAP for 11.12, and disabled all of my OC'ing. What am I missing?

Specs:
CPU: AMD FX4100 @ Stock(OC'd to 4.4GHz before I started troubleshooting this problem!)
Mobo: MSI 990XA-GD55
PSU: SILVERSTONE Strider Essential series ST60F-ES 600W (42A on the 12v rail)
OS: W7 64bit
RAM: 16gb Corsair Vengeance

More about : performance issues 6870 crossfire

January 18, 2012 6:38:31 AM

Bottlenecking :S Spend 30 bucks and get a hyper 212 evo and overclock!!!!!!!!!!!!!!
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January 18, 2012 6:49:36 AM

amuffin said:
Bottlenecking :S Spend 30 bucks and get a hyper 212 evo and overclock!!!!!!!!!!!!!!


I am aware that buying one of the new bulldozers was a very bad idea, but that doesn't help explain the decrease in performance at all. I would understand my FPS staying the SAME if bottlenecking was the only problem here, but it isn't. It's literally lowering the performance.
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January 18, 2012 6:51:38 AM

Because your cpu can't keep up with 2 6870, but it can keep up with 1.
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January 18, 2012 6:56:40 AM

amuffin said:
Because your cpu can't keep up with 2 6870, but it can keep up with 1.


Hmm. Overclocking doesn't seem to change much. I had it going steady at 4.4GHz before I disabled it. Could it be my PSU?
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January 18, 2012 7:03:33 AM

You sir might need to join us intel fanboys. Say what you will, but deep down you know the 2500k is calling your name.
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January 18, 2012 12:56:29 PM

hiimnickwhoareu said:
You sir might need to join us intel fanboys. Say what you will, but deep down you know the 2500k is calling your name.


I can honestly say that I wish I had the means to make an intel build. I am a starving college student. That's why the FX series looked so appealing. The one time I don't look up benchmarks, right? :pfff: 

If I could do it all over, I would be rocking a 2500k, BUT! There's no way I can afford a new mobo AND a 2500k at this point in my life.

Any more ideas anyone? I still think my PSU may be part of the problem. After re overclocking I'm getting crashes, start-up issues, and BSODS.

Power supply??? Anyone??? ANYONE?! :cry: 
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January 18, 2012 1:19:19 PM

Did you test the second/new card by itself to make sure its working correctly?
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January 18, 2012 1:22:24 PM

get the 12.1 preview drivers, worked for me.
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January 18, 2012 3:06:34 PM

4745454b said:
Did you test the second/new card by itself to make sure its working correctly?

I did try that, thanks. It's working just fine. Also, both of my pci-e slots are x16, so no problems there.
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January 18, 2012 3:09:38 PM

guavasauce said:
get the 12.1 preview drivers, worked for me.

How similar was your problem in comparison to mine? Same cards? Same cpu? A little more info would really help me out.
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June 18, 2012 10:24:03 PM

yes i have the same problem here 2 6870CF bad Performance and have a fx 8120 and i have a AMD Phenom II X4 OC at 4.1GHz and still get bad Performance its low gpu usage ever one who have 6870CF seem to have the same problem i think its the driver catalyst but some games like BF3 you will get much better Performance.
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